BrasilPb hello
Particullary
mineoro special serie 2000 it is a kind of "Static Scalar Detector" - very similar to Signore Franco design.
Can you show us "Bobina receptora" - input coil, and give us some data about, how to wind it. (diameter of wire, number of turns, diameter of windings etc.) ??
Ceramic capacitor of 290pF should be connected in parallel to variabile potentiometer (multyturn) for fine trimming of phase and bias amplitude of oscillating stage T1-BC648.
I don't only understand the role of fixd NF-oscillator 730KHZ in amplitude detector and preamplifier stage.
Reg.
Enjoykin4